90) FOSSIL MEDUSA. 
as interpreted by himself, the new name Pelagiopsis leuckarti. He states 
that instead of 48 marginal lobes and 8 feeding arms, which Haeckel 
described, he found only 10 lobes and 5 arms. The view, therefore, that 
the fossil is a rhizostomide is erroneous, since it possesses a wide mouth 
surrounded by a number of channel-shaped arms. Its most striking pecu- 
liarity consists in the pentameral symmetry of the organism, there being 5 
mouth arms and genital cavities and 10 marginal lobes. In its general 
structure it may be compared with Pelagio, 
although it has no traces of marginal tentacles. 
Dr. Brandt is in doubt, however, about the true 
relations of this fossil, as he can not vouch for 
the existence of the 5 arms and genital cavities 
and the 15 marginal lobes. 
Dr. Ammon agrees with Dr. Brandt as to the 
facts observed, but not at all as to his conclusions, 
and he even considered that L. trigonobrachius is 
a laterally crushed specimen of the same species 
shown by the oral impressions in Rk. admirandus 
and R. lithographicus. 
Fia. 22.—Contour drawing of the same 
fossil (fig. 21) according to Haeckel’s resto- 
ration, reduced, and, owing to reduction, by Haeckel and Brandt, respectively, are shown 
reversed (right and left interchanged). a 
FEN TUE, TDS en in the two accompanying diagrammatic figures 
(figs. 21, 22). 
The illustrations of the specimens of this species by Haeckel and Brandt 
The interpretations of this species as made 
are so obscure that I think their reproduction here would not be of sufficient 
service to the student to warrant the attempt. 
LEPTOBRACHITES GIGANTEA Haeckel. 
Palegina gigantea Haeckel, 1869. Zeitschr. fiir wiss. Zoologie, Vol. XLX, pp. 540-544, 
559, Pl. XL. 
Leptobrachites gigantea Haeckel, 1880. System der Medusen, p. 647. 
Leptobrachites gigantea Ammon, 1886. Abhandl. Math.-phys. Classe Konig]. bayer- 
ischen Akad. Wiss., Vol. XV, p. 158. 
Dr. Ammon states that L. gigantea should, without doubt, be struck from 
the list of the medusze, as it represents the circumference of the head and 
the arms of a cephalopod. The shell of the animal is also found on the 
same slab of limestone with the impression of the head and arms. 
